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<div class="header">
  <div class="headertitle"><div class="title">PIC8259.cpp</div></div>
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<div class="contents">
<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/*</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment">  Created by Fabrizio Di Vittorio (fdivitto2013@gmail.com) - &lt;http://www.fabgl.com&gt;</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment">  Copyright (c) 2019-2022 Fabrizio Di Vittorio.</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment">  All rights reserved.</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"></span> </div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"></span> </div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment">* Please contact fdivitto2013@gmail.com if you need a commercial license.</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"></span> </div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"></span> </div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment">* This library and related software is available under GPL v3.</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"></span> </div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment">  FabGL is free software: you can redistribute it and/or modify</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment">  it under the terms of the GNU General Public License as published by</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment">  the Free Software Foundation, either version 3 of the License, or</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment">  (at your option) any later version.</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"></span> </div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment">  FabGL is distributed in the hope that it will be useful,</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">  but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment">  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="comment">  GNU General Public License for more details.</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="comment"></span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="comment">  You should have received a copy of the GNU General Public License</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="comment">  along with FabGL.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="comment"> */</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span> </div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="preprocessor">#include &quot;PIC8259.h&quot;</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span> </div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="keyword">namespace </span>fabgl {</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span> </div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="preprocessor">#define ICW1_IC4   0x01    </span><span class="comment">// 1 = ICW4 needed</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="preprocessor">#define ICW1_SNGL  0x02    </span><span class="comment">// 1 = single mode, 0 = cascade mode</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="preprocessor">#define ICW1_LTIM  0x08    </span><span class="comment">// 1 = level trig imput, 0 = edge trig input</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span> </div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="preprocessor">#define ICW4_PM    0x01    </span><span class="comment">// 1 = x86, 0 = 8085</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="preprocessor">#define ICW4_AEOI  0x02    </span><span class="comment">// 1 = auto EOI, 0 = normal EOI</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="preprocessor">#define ICW4_MS    0x04    </span><span class="comment">// valid when ICW4_BUF = 1:  0 = buffered mode slave, 1 = buffered mode master</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="preprocessor">#define ICW4_BUF   0x08    </span><span class="comment">// 1 = buffered mode, 0 = non buffered mode</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="preprocessor">#define ICW4_SFNM  0x10    </span><span class="comment">// 1 = special fully nested mode</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span> </div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="preprocessor">#define OCW2_EOI   0x20    </span><span class="comment">// 1 = EOI command</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="preprocessor">#define OCW2_SL    0x40    </span><span class="comment">// 1 = with EOI means Specific, with R means Set Priority</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="preprocessor">#define OCW2_R     0x80    </span><span class="comment">// 1 = with EOI means Rotate, with SL means Set Priority</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span> </div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="preprocessor">#define OCW3_RIS   0x01    </span><span class="comment">// 1 = with OCW3_RR means Read IS register, 0 = with OCW3_RR means Read IR register</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="preprocessor">#define OCW3_RR    0x02    </span><span class="comment">// 1 = OCW3_RIS specifies which register to read, 0 = no action</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="preprocessor">#define OCW3_POLL  0x04    </span><span class="comment">// 1 = poll command</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="preprocessor">#define OCW3_SMM   0x08    </span><span class="comment">// valid when OCW3_ESMM = 1: 0 = reset special mask, 1 = set special mask</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span> </div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="preprocessor">#define PORT0_ICW1 0x10    </span><span class="comment">// 1 = presenting ICW1 on port 0, 0 = presenting OCW2 or OCW3 on port 0</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="preprocessor">#define PORT0_OCW3 0x08    </span><span class="comment">// 1 = presenting OCW3 on port 0, 0 = presenting OCW2 on port 0</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span> </div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span> </div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment">// m_state meaning</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="preprocessor">#define STATE_READY         0x00 </span><span class="comment">// waiting for ICW1/OCW2/OCW3 on port 0, OCW1 on port 1</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="preprocessor">#define STATE_WAITING_ICW2  0X01 </span><span class="comment">// waiting for ICW2 on port 1</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="preprocessor">#define STATE_WAITING_ICW3  0X02 </span><span class="comment">// waiting for ICW3 on port 2</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="preprocessor">#define STATE_WAITING_ICW4  0X04 </span><span class="comment">// waiting for ICW4 on port 3</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span> </div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span> </div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="keywordtype">void</span> PIC8259::reset()</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>{</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span>  m_state               = STATE_READY;</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>  m_readISR             = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>    m_IRR                 = 0x00;</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span>    m_IMR                 = 0xff;</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span>    m_ISR                 = 0x00;</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span>  m_autoEOI             = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span>  m_baseVector          = 0x00;</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span>  m_pendingInterrupt    = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>  m_pendingIR           = 0;</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span>}</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span> </div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span> </div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="keywordtype">void</span> PIC8259::write(<span class="keywordtype">int</span> addr, uint8_t value)</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span>{</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>  <span class="keywordflow">switch</span> (addr) {</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span> </div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>    <span class="keywordflow">case</span> 0:</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span>      <span class="keywordflow">if</span> (value &amp; PORT0_ICW1) {</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span>        <span class="comment">// getting ICW1</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span>        <span class="comment">//printf(&quot;ICW1 &lt;= %02X\n&quot;, value);</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>        <span class="comment">//printf(&quot;  LTIM=%d ADI=%d SNGL=%d IC4=%d\n&quot;, (bool)(value &amp; 0x08), (bool)(value &amp; 0x04), (bool)(value &amp; 0x02), (bool)(value &amp; 0x01));</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>        m_state  = STATE_WAITING_ICW2;</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>        m_state |= value &amp; ICW1_IC4 ? STATE_WAITING_ICW4 : 0;</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>        m_state |= value &amp; ICW1_SNGL ? 0 : STATE_WAITING_ICW3;</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span>      } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (value &amp; PORT0_OCW3) {</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span>        <span class="comment">// getting OCW3</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>        <span class="comment">//printf(&quot;OCW3 &lt;= %02X\n&quot;, value);</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>        <span class="comment">//printf(&quot;  ESMM=%d SMM=%d P=%d RR=%d RIS=%d\n&quot;, (bool)(value &amp; 0x40), (bool)(value &amp; 0x20), (bool)(value &amp; 0x04), (bool)(value &amp; 0x02), (bool)(value &amp; 0x01));</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>        <span class="keywordflow">if</span> (value &amp; OCW3_RR)</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>          m_readISR = value &amp; OCW3_RIS;</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>      } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span>        <span class="comment">// getting OCW2</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>        <span class="comment">//printf(&quot;OCW2 &lt;= %02X\n&quot;, value);</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>        <span class="comment">//printf(&quot;  R=%d SL=%d EOI=%d L210=%d\n&quot;, (bool)(value &amp; 0x80), (bool)(value &amp; 0x40), (bool)(value &amp; 0x20), value &amp; 7);</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span>        <span class="keywordflow">if</span> (value &amp; OCW2_EOI) {</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span>          <span class="comment">// perform EOI</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span>          performEOI();</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span>        }</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span>      }</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span> </div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span>    <span class="keywordflow">case</span> 1:</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span>      <span class="keywordflow">if</span> (m_state &amp; STATE_WAITING_ICW2) {</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span>        <span class="comment">// getting ICW2</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span>        <span class="comment">//printf(&quot;ICW2 &lt;= %02X\n&quot;, value);</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>        m_baseVector = value &amp; 0xf8;</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>        m_state &amp;= ~STATE_WAITING_ICW2;</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>      } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (m_state &amp; STATE_WAITING_ICW3) {</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>        <span class="comment">// getting ICW3</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>        <span class="comment">//printf(&quot;ICW3 &lt;= %02X\n&quot;, value);</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>        <span class="comment">// not supported, nothing to do</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>        m_state &amp;= ~STATE_WAITING_ICW3;</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>      } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (m_state &amp; STATE_WAITING_ICW4) {</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span>        <span class="comment">// getting ICW4</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span>        <span class="comment">//printf(&quot;ICW4 &lt;= %02X\n&quot;, value);</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>        <span class="comment">//printf(&quot;  SFNM=%d BUF=%d M/S=%d AEOI=%d uPM=%d\n&quot;, (bool)(value &amp; 0x10), (bool)(value &amp; 0x08), (bool)(value &amp; 0x04), (bool)(value &amp; 0x02), (bool)(value &amp; 0x01));</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span>        m_autoEOI = value &amp; ICW4_AEOI;</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span>        m_state &amp;= ~STATE_WAITING_ICW4;</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>      } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span>        <span class="comment">// getting OCW1</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span>        <span class="comment">//printf(&quot;OCW1 &lt;= %02X\n&quot;, value);</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span>        m_IMR = value;</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span>      }</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>  }</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span>}</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span> </div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span> </div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>uint8_t PIC8259::read(<span class="keywordtype">int</span> addr)</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span>{</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>  <span class="keywordflow">switch</span> (addr) {</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span> </div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>    <span class="keywordflow">case</span> 0:</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span>      <span class="comment">//printf(&quot;%02X &lt;= %s\n&quot;, m_readISR ? m_ISR : m_IRR, m_readISR ? &quot;ISR&quot; : &quot;IRR&quot;);</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>      <span class="keywordflow">return</span> m_readISR ? m_ISR : m_IRR;</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span> </div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span>    <span class="keywordflow">case</span> 1:</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span>      <span class="comment">//printf(&quot;%02X &lt;= IMR\n&quot;, m_IMR);</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span>      <span class="keywordflow">return</span> m_IMR;</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span> </div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>    <span class="keywordflow">default</span>:</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span>      <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span> </div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span>  }</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>}</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span> </div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span> </div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span><span class="comment">// ret: 0..7</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span><span class="comment">// 256 = no bit set</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span><span class="keywordtype">int</span> PIC8259::getHighestPriorityBitNum(uint8_t value)</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>{</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span>  <span class="keywordflow">if</span> (value) {</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span>    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; 8; ++i)</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span>      <span class="keywordflow">if</span> ((value &gt;&gt; i) &amp; 1)</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span>        <span class="keywordflow">return</span> i;</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span>  }</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span>  <span class="keywordflow">return</span> 256;</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span>}</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span> </div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span> </div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">// set as pending interrupt the higher priority bit in M_IRR</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="keywordtype">void</span> PIC8259::setPendingInterrupt()</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span>{</div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span>  <span class="keywordtype">int</span> highestInt   = getHighestPriorityBitNum(m_IRR &amp; ~m_IMR);</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span>  <span class="keywordtype">int</span> servicingInt = getHighestPriorityBitNum(m_ISR);</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span>  <span class="comment">//printf(&quot;PIC8259::setPendingInterrupt(), highestInt=%d, servicingInt=%d\n&quot;, highestInt, servicingInt);</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span>  <span class="keywordflow">if</span> (highestInt &lt; servicingInt) {</div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span>    <span class="comment">// interrupt in IRR has higher priority than the servicing one</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span>    m_pendingInterrupt    = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span>    m_pendingIR           = highestInt;</div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span>  }</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span>}</div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span> </div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span> </div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="comment">// Device-&gt;8259: a device reports interrupt to 8259</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="keywordtype">bool</span> PIC8259::signalInterrupt(<span class="keywordtype">int</span> intnum)</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span>{</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span>  <span class="comment">//printf(&quot;PIC8259::signalInterrupt(%d)\n&quot;, intnum);</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span>  <span class="keywordtype">bool</span> success = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span>  intnum &amp;= 7;</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span>  <span class="comment">// already servicing?</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span>  <span class="keywordflow">if</span> ((m_ISR &amp; (1 &lt;&lt; intnum)) == 0) {</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span>    <span class="comment">// no, request interrupt</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span>    m_IRR |= 1 &lt;&lt; intnum;</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span>    setPendingInterrupt();</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span>    success = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span>  }</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span>  <span class="keywordflow">return</span> success;</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span>}</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span> </div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span> </div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="comment">// CPU-&gt;8259: CPU acks the pending interrupt to 8259</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span><span class="keywordtype">void</span> PIC8259::ackPendingInterrupt()</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span>{</div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span>  <span class="comment">//printf(&quot;PIC8259::ackPendingInterrupt(), pending IR = %d\n&quot;, m_pendingIR);</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span>  <span class="keywordtype">int</span> pendmsk = 1 &lt;&lt; m_pendingIR;</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span>  m_ISR |= pendmsk;  <span class="comment">// set interrupt bit in ISR</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span>  m_IRR &amp;= ~pendmsk; <span class="comment">// reset interrupt bit in IRR</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span>  m_pendingInterrupt = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span>  <span class="comment">//printf(&quot;   ISR=%02X   IRR=%02X\n&quot;, m_ISR, m_IRR);</span></div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span>}</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span> </div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span> </div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span><span class="comment">// application reports EOI (of the higher interrupt)</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span><span class="keywordtype">void</span> PIC8259::performEOI()</div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span>{</div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span>  <span class="comment">//printf(&quot;PIC8259::performEOI()\n&quot;);</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span>  <span class="comment">// reset servicing int</span></div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span>  <span class="keywordtype">int</span> servicingInt = getHighestPriorityBitNum(m_ISR);</div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span>  m_ISR &amp;= ~(1 &lt;&lt; servicingInt);</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span>  <span class="comment">// is there another interrupt to ask for ack?</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span>  setPendingInterrupt();</div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span>}</div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span> </div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span> </div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span>} <span class="comment">// namespace fabgl</span></div>
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